@deckchair
The situation is: I drive the car and i can feel it coming up i think, the car seems to hold a seconds, and then struggles 1/4 second and cuts out. The car is throwing up many faults and after turned off the ignition switch and on again the car won't start. The diffrence is that the car security symbol is on. It won't start but sometimes after a few turns it wil start, but dies a few seconds later on idle. Then a few turns later it wil start again and if i rev it up, it won't die or that's what i think. This time i spend a little more attention on the instruments and i saw my rpm and speed fall down, come up and down in a split second.
I tested the earth on the battery, and that's fine. But are there more earth points to check?
The car is not modified, just a basic 1.6 16v.
"take it to another garage then, theres one simple test (dealer only) that would go along way (in this case I reckon 90%) to pinpointing the fault."
What test are you talking about?